# All files / src/utils FileLoader.ts

97.43% Statements 38/39
85.29% Branches 29/34
100% Functions 1/1
97.36% Lines 37/38

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     import { promises as fs } from "fs";
    import * as path from "path";
    import { ContentPart } from "../chat/Content.js";

    const MIME_TYPES: Record<string, string> = {
      ".jpg": "image/jpeg",
      ".jpeg": "image/jpeg",
      ".png": "image/png",
      ".gif": "image/gif",
      ".webp": "image/webp",
      ".mp4": "video/mp4",
      ".mpeg": "video/mpeg",
      ".mov": "video/quicktime",
      ".wav": "audio/wav",
      ".mp3": "audio/mpeg",
      ".json": "application/json",
      ".js": "text/javascript",
      ".mjs": "text/javascript",
      ".cjs": "text/javascript",
      ".ts": "text/typescript",
      ".rb": "text/x-ruby",
      ".py": "text/x-python",
      ".txt": "text/plain",
      ".md": "text/markdown",
      ".html": "text/html",
      ".css": "text/css",
      ".xml": "text/xml",
      ".yml": "text/yaml",
      ".yaml": "text/yaml",
      ".csv": "text/csv",
      ".go": "text/x-go",
      ".java": "text/x-java",
      ".c": "text/x-c",
      ".cpp": "text/x-c++",
      ".rs": "text/x-rust",
      ".swift": "text/x-swift",
      ".kt": "text/x-kotlin",
      ".pdf": "application/pdf"
    };

    const TEXT_EXTENSIONS = new Set([
      ".json",
      ".js",
      ".mjs",
      ".cjs",
      ".ts",
      ".rb",
      ".py",
      ".txt",
      ".md",
      ".html",
      ".css",
      ".xml",
      ".yml",
      ".yaml",
      ".env",
      ".csv",
      ".go",
      ".java",
      ".c",
      ".cpp",
      ".rs",
      ".swift",
      ".kt"
    ]);

    export class FileLoader {
      static async load(filePath: string): Promise<ContentPart> {
        if (filePath.startsWith("http")) {
          try {
            const response = await fetch(filePath);
            if (!response.ok) throw new Error(`Failed to fetch file: ${response.statusText}`);

            const buffer = await response.arrayBuffer();
            const contentTypeFull = response.headers.get("content-type") || "image/jpeg";
            const contentType = (contentTypeFull.split(";")[0] ?? "image/jpeg").trim();
            const base64 = Buffer.from(buffer).toString("base64");
            const dataUri = `data:${contentType};base64,${base64}`;

            if (contentType.startsWith("image/")) {
              return { type: "image_url", image_url: { url: dataUri } };
            }

            if (contentType.startsWith("audio/")) {
              const format = contentType.split("/")[1];
              return {
                type: "input_audio",
                input_audio: {
                  data: base64,
                  format: (format === "mpeg" ? "mp3" : format) ?? "wav"
                }
              };
            }

            Eif (contentType.startsWith("video/")) {
              return { type: "video_url", video_url: { url: dataUri } };
            }

            // Default to image_url for unknown binary or use as-is
            return { type: "image_url", image_url: { url: dataUri } };
          } catch {
            // Fallback to URL if fetch fails
            return { type: "image_url", image_url: { url: filePath } };
          }
        }

        if (filePath.startsWith("data:")) {
          return { type: "image_url", image_url: { url: filePath } };
        }

        const ext = path.extname(filePath).toLowerCase();
        const mime = MIME_TYPES[ext] ?? "application/octet-stream";

        if (TEXT_EXTENSIONS.has(ext)) {
          const content = await fs.readFile(filePath, "utf-8");
          return {
            type: "text",
            text: `\n\n--- File: ${path.basename(filePath)} ---\n${content}\n--- End of File ---\n`
          };
        }

        // Binary files (Images, Video, Audio)
        const data = await fs.readFile(filePath);
        const base64 = data.toString("base64");
        const dataUri = `data:${mime};base64,${base64}`;

        if (mime.startsWith("image/")) {
          return { type: "image_url", image_url: { url: dataUri } };
        }

        if (mime.startsWith("audio/")) {
          // OpenAI expects 'wav' or 'mp3' as format, not full mime
          const format = mime.split("/")[1];
          return {
            type: "input_audio",
            input_audio: {
              data: base64,
              format: (format === "mpeg" ? "mp3" : format) ?? "wav"
            }
          };
        }

        if (mime.startsWith("video/")) {
          // For now, treat video as a URL (some providers might support data URIs for video)
          return { type: "video_url", video_url: { url: dataUri } };
        }

        // Fallback for unknown binary types
        return { type: "image_url", image_url: { url: dataUri } };
      }
    }